Multi-fly bag



31, 1935. WEAVER Re. 19,803

lULTIPLY B'AG Original Filed Dec. 15, 1932 5 Sheets-Sheet l B. B. WE AVER uuLTI-PLY BAG Dec. 31, 1935.

Original Filed Dec. 15 1932 I5 Sheets-Sheet 3 Brenton fiya'low Wan ar name Dec. 31, less I UNITED STATES Brenton lligelew Weaver,

Origin! M BerialNo. 647,207. tion for reissue lay my invention relates to multi-ply begs. particlarly to multi-ply valve bags for cement and other pulverulent materials.

Theordinaryvalvebag certaindiss advantages due to the heretofore inevitable leakage through the valve opening. various attempts havebeenmadetocloseorpartially clos'ethis opening, as by stitches or clips through the valve mouth. Buch expedients, however. require an additional closing step after filling and thus largely nullify the most important advantage of the valved type of bag.

The primary object of my inventon is to make a valve bag. the valve of which will remain closed it underanycircumstanceafterfillingthebag.

A further object of my invention is to make a valve bag of the inserted sleeve type having a durable sleeve therein which will not tear loose from the bag walls and is proof against accidental 20 rupture by a filling spout.

Another object of my invention is to make a valve bag of the inserted sleeve tim the sleeve of which is adapted to be folded within itself so as toprevent any sifting of material through the 25 v lve.

A still further object of my invention is to make a strong. rounded valve opening which can easily be drawn over a filling spout.

My improved bag is of simple construction and S maybemadeonexistingmachineswithvery little adjustment of parts.

Referring to the acco drawings in whichlikefiguresrefertothesameparts:

l lg.l isanendviewofafour-plybeglength slrowingtheslitsmadeineachplytoformthe valve opening.

llmiisaperspeetiveofthebaglengthof Fig. L'showingtheopeningexpanded, andone form of valve sleeve.

I'lg.3isa-perspectiveofthebaghavingthe aleevu in place.

l'lg.4isa perspectiveviewotamodifiedvalve unfolded.

l'igJis aperspectiveviewofabagiengthand the valve sleeve of Fig. 4.

l'lg'Jhaaectionalviewtakenalongthecem' the ounpietsd bag and valve sleeve of .'liaaviewsimilartollg.6showingthe sleeveofl'igJaspositionedafterthebag l'lg. 'll is'a perspective view showing a valve memes visualsm Delaware 2 dated 15,1083. sppliea 17. 1035. serIalNa-Ml isciainn. (cam-e) PATENT OFFICE mill-PL! BAG llontreaLqlebee.

Ins-.aeerpaeathnof Fig. Iisanendviewoftheblg of l'lgJwith the sleeve in place.

l 'ig. lilisasectiontakenonline iQ-llof l 'lg.ll showsthevalvesleeveaspiacedupon a gusseted bag length.

Fig. l2isaseetionofthebagof1'lg.8in the course of being filled.

Fig. 18 is a section of the same bag in itempletely filled state.

The bags as illustrated are of four-ply construction, each ply formed of a strip of paper or other fabric formed into a tube with the edges of the strip overlapping and-adhered to each other. Each such tube is nested within another tube with the overlapped edges of each tube substantially abutting the edges of adjacent tubes. The nested tubes may be formed in any manner known in the art, as the invention is not directed to that feature. The tubes are formed fiat and cut into lengths suitable for bags. The valve sleeve may be formed of any suitable material, such as that which makes up the bag and other kinds and qualities of paper or fabricsmay be used. While the invention is preferably applied tothefiattypeofbag,itcanbeandisapplied tothegussetedbagasshownin?lg.1l. Ihave illustrated my invention as applied to four-ply bags, but obviously a greater or lesser number of plies may be used without departing from the spirit of the invention.

Referring to Fig. l, the bag length l is shown asformedoifournestedtubes 2,3,4andl. The

tudinallythereofatthefoldformedwhenthe tubes are fiattened; the tube [is similarly slit at I, a short distance inwardly from the fold;

thetubeslandeareslitprwrel lvelyinfrom the fold at I and I respectively; thus an opening I. (Fig. 2) extending diagonallyinward through the side wall of the bag the fold toward the center the sides of the-opening II. or to both surfaces as illustrated. The sleeve is then placed in the opening II, with its upper edge fiush with the upper edge of the bag, the fold ll fiush with the fold of the bag, and fiaps II and II folded around the edges of the opening II and adhered to the outer bag-ply l. The bag mouth is then clo'sed I by a line of stitches 2| running across its upper edge and including the upper edge of the sleeve II, the other end of the bag being closed in any desired manner. such as by similarly placed stitches. Strips of crinkly kraft paper or other fabric 22 may be folded over the ends of the bag and adhered to the outer ply I as an additional sleeve II is illustrated. This sleeve is made substantially the same as sleeve ll (Fig. 2) except that fold it extends beyond edge Ill and the inner plies are creased at It and II, substantially from the end of slit II at the bottom of the V diagonally upward toward the open end of fold II, for a purpose to be disclosed.

Figs. 8. 9 and 10 show a modified form of construction in which either sleeve ll or II is embedded in the side wall of the bag through the opening formed by the edges of the nested tubes, the fiaps II and II being adhered to the outer ply 2 as before. It can readily be seen that the edges of the tubes do not need to be at the center of the bag and that as they approach the fold a construction will be obtained closely approximating that of Fig. 2. In this form it is not necessary to slit the bag plies as at], I, I, 8 (Fig.1). The sleeve may be applied to a gussetted bag in the same manner.

Fig. 11 illustrates the invention as applied to a gussetted bag I. In this construction one of the folds of the gusset is slit in the same manner as the fold of the fiat bag of Fig. 2, and the sleeve, II or II, may be inserted as illustrated. This type of bag is similarly closed by sewing through its end edges, the stitches including the upper edge of the sleeve and the gussets, and may also have strips of fabric folded over its ends and adhered theretd.

In each of the illustrated form the features of my invention are embodied. The valve in each form consists of a sleeve firmly embedded in the side wall of the bag and having protecting fiaps covering the edges of the opening into which it is inserted and adhered to the outer bag-ply, thus forming a durable reenforced valve mouth which can be easily slipped over a filling spout.

Fig. 12 illustrates the finished bag in the course of being filled with pulverulent material 24 discharged through a filling spout 21. In sleeved valve bags as heretofore constructed the sleeve is inserted directly through the fold of the bag. The material in such a has. pressing against the sleeve, tends to hold it closed by pressure on the sleeve alone. This type of valve sleeve does not always remain closed, especially if the bag is frequently handled and the'contents shift from side to side. Fig. 13 illustrates how my improved valve overcomes this defect. The sleeve, being em in the side walls, is held closed not only by the pressure of the pulveruleut material on the mace area of the sleeve itself, but also by the inherent stiffness of the bag wall and the pressure of the material against a large portion of the wall enclosing the sleeve, thus making a valve which will be held closed under any circumstance. An- 6 other readily apparent feature of my improved bag is that since the sleeve penetrates the inner ply of the bag at a point removed from the told, there is no opportunity for the pressure holding it shut to be removed by a shift of the material in to the other side.

The form of sleeve ll illustrated in Figs. 4 to 7 further prevents any loss of finely powdered material which in older types of bags could not be prevented from sifting through the valve 15 month. This sleeve, as has been pointed out, is creased at II and it. After filling the bag the projecting point 01' fold I5 may be grasped and pulled upwardly into the sleeve, the creases Ill and is forming lines along which the inner plies of the sleeve will easily fold. The fold It is made to project beyond the edge 20 so that whatever means may be used to pull it upwardly will not also engage the edge 20 and tear the entire sleeve from adherence to the bag plies. A simple means of efi'ecting the closure of the valve Just described is to provide a hook-like projection on the under side of the filling spout so placed as to engage the fold it and draw it into the sleeve as the spout leaves the opening. The fold II extends far enough beyond the edge Ill so that the pressure from beneath, as the bag is filled, will lift the bottom of the fold to the top of the bag, thus causing it to enter and close the sleeve, so that a grasping or booking action is not essential to a functioning of the fold as a valve. It is to be understood that the inner piles of sleeve l I may be also creased as at it and II, or that the creases may be dispensed with altogether, it being apparent that my sleeve in any of its forms may have its inner plies pulled upwardly as in Fig. 7. The 'fiap, so formed, effectively closes the valve opening against any leakage whatsoever, preventing any finely powdered material which may sift through the inner end of the sleeve from escaping.

It will be apparent that a valve has constructed according to my invention will at all times remain closed due to the pressure oi the bag's contents. and that none of the contents can sii't through the valve. It will also be apparent that a durable construction is obtained and that the rounding oi the valve mouth enables the bag to be easily slipped over a filling spout.

As will be evident to those skilled in the art, my invention permits various modifications without departing from the spirit thereof, and [do not intend to be limited except as set forth in the subiolned claim which are to be broadly construed. E

1. A multi-ply baghaving a valve sleeve embedded in a side wall, the sleeve having fiaps extending therefrom and adhered to the outer bag- 5 Ply.

2. A multi-ply valve bag having a valve sleeve embedded in a side wall and extending diagonally inward, the sleeve having flaps extending outward and adhered -to the outer bag-ply.

3. A multi-ply valve bag having a valve sleeve embedded in a side wall formed of a sheet of paper or'other fabric folded upon itself to form a sleeve of three plies, the inner plies extending into the bag beyond the outer ply and having 76 creases therein forming lines along-which they may be folded up within the outer ply.

4. A valve sleeve for valvebags formed of a sheet of paper or other fabric folded upon itself to form a muiti-ply blank, the blank being doubled upon itself to form a V-shaped sleeve, a ply of the sleeve projecting beyond other plies and slit to form flaps.

5. A valve sleeve for valve bags formed of a sheet of paper or other fabric folded upon itself .to form a multi-ply blank, certain of the plies exceeding the remainder in one dimension, the blank being folded to form a V-shaped sleeve with a smaller ply outside. and the inner plies having creases extending substantially from the bottom of the V diagonally upward toward the open end.

6. In the sleeve as described in claim 5, the innermost ply projecting beyond the others and being slit to form flaps.

'7. A multi-ply valve bag formed of nested tubes having the outer tube slit at the fold from one end a short distance longitudinally thereof, the other tubes being similarly slit at progressive intervals inwardly from the fold, the slits forming a valve opening extending from the fold diagonally through the wall of the bag, and a sleeve inserted in said opening and having an end secured to the outer surface of the bag.

8. A multi-ply valve bag formed of nested tubes having the outer tube slit at the fold from one end a short distance longitudinally thereof, the

other tubes being similarly slit at progressive intervals inwardly from the fold, the slits forming a valve opening extending from the fold diagonally through the wall of the bag, and a valve sleeve embedded in the opening and adhered to the sides thereof and having flaps extending outwardly and adhered to the outer tube.

' 9. A multi-ply valve has formed of nested tubes having the outer tube slit at the fold from one end a short distance longitudinally thereof, the other tubes being similarly slit at progressive intervals inwardly from the fold, the slits forming a valve opening extending from the told diagonally through the wall of the bag, and a valve sleeve embedded in the opening and adhered to the sides thereof and having flaps extending outwardly and adhered to the outer tube, the mouth ofthebagbeingclosedbyalineoistitchesincluding the upper edge of the sleeve.

\opening for filling said bag, and

10. A multi-ply valve bag formed of nested tubeshavlngtheoutermbe slit at thefolda short distance longitudinally thereof from one end, the other tubes being similarly slit at progressive intervals inwardly from the fold; the 5 slits forming a valve opening extending from the fold diagonally through the wall of the bag, a vrlve sleeve embedded in the opening and adhered to the sides thereof having flaps extending therefrom and adhered to the outer tube, the bag being closed by a line of stitches along the upper edge and including the upper edge of the sleeve, and a strip of crinkly kraft paper folded over the end ofthe bag and adhered to the outer tube.

11. A paper bag comprising a tube closed at both ends and having a. valve opening, a sleeve secured in said opening, said sleeve having a portion for engagement with means associated with the filling spout inserted through the valve means formed within said sleeve to facilitate drawing said portion into said opening, upon a withdrawal of the filling spout, to close said valve.

12. A paper bag comprising a tube closed at both ends and having a valve opening at one end, 5 and a sleeve secured in the opening, said sleeve consisting of an outer portion and a relatively loose inner portion surrounded by said outer portion and secured at its outer end whereby a filling spout may be inserted through said sleeve with- 0 out disturbing the relative arran ement of the portions of the sleeve and whereby the inner end of said inner portion may be drawn back within said outer portion and caused to block the opening upon withdrawal of the tllling spout.-

13. A paper bag comprising a tube closed at both ends by closure means and having a valve opening at one end, and a sleeve secured in the opening having an edge retained by the closure means of the adjace t end of the bag tube, said 40 sleeve consisting of an outer portion and a relatively loose inner portion surrounded by said I outer portion and secured at its outer-end where byanllingspoutmaybeinsertedthroughsaid sleeve without disturbing the relative arrangeg5 ment of the portions of the sleeve and whereby the inner end of said inner portion may be drawn back within said outer'portion and caused to blocktheopeninguponwithdrawalofthemling spout.

BRE'N'ION BIGELON WEAVER. 

